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I would suggest that people should be very careful mounting 8/10 ply tires on vintage wheels, especially wheels that were intended by the manufacture to have 600 x 16 on a 4" rim.
During the '40's/50"s my father was a Ceramic Tile & Marble Contractor. Dad learned the had way that heavy loads with over-size tires was nothing but trouble, the wheel would split right at the bead line, sometimes as much a half the circumference of the wheel which really made a mess of the fender and bed of the truck.
During the late '30's and through the '40's Dad generally had the wheels changed to the artillery style, which was a HD wheel. During the late '50's Dad switched to split rims on his trucks.